Pencil sharpener



May 20, 1941. G. DESSONNAZ PENCIL SHARPENER Filed March 29, 1940 c-v2688077199 i -M 4 .Patente d. May 20, 19%! tea I rnivorn smmrnunn,Georges Dessonnaz, Fribonrg, Switzerland, assignor of one-half to Rogerde Werra, e.

Switzerland Application Manna, 1940, Serial No. 326,771

In Switzerland April. a, 1939 ..5Claims.

I The present invention relates to a pencil sharpener and has for itsobject to provide improved means for sharpening leads of pencils.

The invention also consists in the further features hereinafterdescribed and set forth in the dependent claims, reference being had tothe accompanying drawing which illustrates, by way of example, twoembodiments thereof and wherein:

Fig. 1 is an elevation and Fig. 2 a plan view "showing the firstembodiment of the invention,

while Fig. 3 represents a sectional view taken on the line 33 in Fig. 2.Fig. 4 is an elevation accordingto the second embodiment of theinvention, and Fig. 5 shows a sectional view taken on the line 5-5 inFig. 4. Thepencil sharpener according to the Figs. 1 to 3 comprises asupport formed to include a body I and a base 2 made for instance ofaluminium plate and shaped by means of a sheet metal pressing machine.The body I is constructed of two hollow cylinders 3 and 4 of differentdiameter and connectedto each other by a shoulder 5, the cylinder 3being partly closed at its top by an end wall 6 having a centralaperture I formed by an inwardly projecting border 8 of said wall.

means of the device l3; then it is introduced into the socket l5,whereby the said lead projects through the bore of the coniform bottomof said socket to get into contact with the abrading surface ll .of thering l3. Then, a circular movement is imparted to thepencll (see Fig. 2)while turning the same between the fingers,

whereby the socket l5 guided by the projection The base 2 is shownhaving a lower cylindrical portion 9, a shoulder It, a cylindricalportion H, and a tapered central projection l2 extending axially intothe body I.

Between the shoulder 5 of the body I and the base 2 is clamped acircular ring I3 of casehardened steel, said ring being slightly taperedas shown and affording internally a knurled or abrading surface Id.

Within the cylinder 3 of the body I is disposed a socket is extendingthrough the aperture 1 of said cylinder and being adapted to receive thepencil P to be sharpened. The top of said socket is formed to provide aball and socket joint l6 which is somewhat larger in diameter than theaperture 7 so as to rest onthe border 8 forming said aperture. Thebottom of the socket is coniform and presents a central bore providing apassage for the lead of the pencil P. The socket presents further on itsmiddle portion an outer collar H which is slightly spaced apart fromsaid ball and socket joint.

The base 2 is provided with a lateral opening l8 housing any knowncutting device l9 adapted to cut or point the wooden shafts of pencils.

The above described pencil sharpener is to be used in the following way:

The pencil. P is first placed into the aperture It to relieve the leadfrom the wooden shaft by I! of the base 2' partakes of said movement andfollows the circumference of a cone in such a way as to hold the lead ofthe pencil in permanent ring l3. Owing to the friction produced on thesaid surface, the lead is quickly sharpened and thereby assumes atapered form. It will be suflicient to revolve the pencil a few times togive its lead of whatever shape a perfectly sharpened form.

The collar I'I cooperates with the border 8 of the aperture 1 so as toprevent the socket I5 from being intempestively withdrawn from the bodyl as long as the said body and the base 2 are maintained assembled.

The pencil sharpener illustrated in Figs. 4 and 5 comprises a body 2|made of mould material such as Bakelite or the like; this body which maybe in the form of a hollow cylinder is pref erably cut with facets atits outer surface and affords at its bottom a screw thread 23 adapted toengage a threaded base 24 which may be made of the same material as thebody 2!.

The body 3i presents at its top a central aperture 25 formed by aninwardly projecting border 26 of said body; it is also provided with aninner flange 21 as shown in Fig. 5. Through the aperture 25 extends asocket 28 which is of the same I construction as the socket l5 of theembodiment first described. Between the base 25 and the flange 2'! isinserted a tapered ring 23 not different from the ring I3 previouslydescribed. Moreover, the base 24 and the said ring 23 clamp between eachother a member of aluminium plate constructed to form a flange 30 and atapered central projection 3! extending axially into the body 2i, saidmember being adapted to constitute a guide for the socket 28 to which acircular movement may be imparted in the above described manner.

The base 24 also houses a cutting device 32 of the known type, adaptedto cut the wood of pencils before sharpening the leads of the latter. Iclaim: e

1. Pencil sharpener, in combination a support, an abrading conicalsurface within said support,

a guide member disposed concentrically to thelongitudinal axis of saidsurface, and a ball and socket joint carried by said support above saidformed of a hollow cylinder and a base detach-H ably assembled to eachother, said cylinder having at its top a central aperture forming aseat. a tapered ring disposed concentrically in said cylinder andaffording an abrading inner surface coaxial with said aperture, a guidemember disposed concentrically to the longitudinal axis of said surface,and a ball and socket joint resting on the seat of said cylinder abovesaid surface, said joint being diametrically perforated to engage apencil and being capable of oscillatory motion about a point of saidaxisso as to revolve said pencil around said guide member while bringing thelead into contact with the abradin surface for sharpening said leadthe'reon upon revolving said pencil.

3. Pencil sharpener, in combination a support formed of a hollowcylinder and a base detach-v ably assembled to each other, said cylinderbeing provided with a lateral shoulder and having at its top a centralaperture forming a seat, a tapered ring disposed concentrically in saidcylinder, said ring being clamped between said base and the lateralshoulder of said cylinder and affording an abrading inner surfacecoaxial with said aperture, a guide member formed integral with saidbase and projecting therefrom concentrically to the longitudinal axis ofsaid surface, and a ball and socket joint resting on the seat of saidcylinder above said surface, said joint being diametrically perforatedto engage a pencil and bein capable of oscillatory motion about a pointof said axis so as to revolve'sald pencil around said guide member whilebringing the lead into contact with the abrading surface for sharpeningsaid lead thereon upon revolving said pencil.

4. Pencil sharpener, in combination a support formed of a hollowcylinder and a base detachably assembled to -each other, said cylinderbeing provided with a lateral shoulder and having at its top a centralaperture forming a seat, a tapered ring disposed concentrically in saidcylinder, said ring being clamped between said base and the lateralshoulder of said cylinder and affording an abrading inner surfacecoaxial with said aperture, a guide member formed integral with saidbase and proiecting'therefrom concentrically to the longitudinal axis ofsaid surface.

the same in a determined position with respect to the tapered ring, andsaid joint being capable of oscillatory motionabout a point of said axisso as to revolve said pencil around said guide member while bringing thelead into contact with the abrading surface for sharpening said leadthereon upon revolving said pencil.

5. Pencil sharpener according to claim 4, said socket presenting anouter collar capable of seating against the border of the centralaperture of the cylinder so as to prevent said socket from beingintempestively withdrawn from the support as long as the cylinder andthe, base are maintained assembled.

GEORGES DESSONNAZ.

